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Finding the Fourth Proportional to 70.89, 97.80 and 41.79

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Solution

The fourth proportional to 70.89, 97.80 and 41.79 is: 57.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.89 : 97.80 = 41.79 : x
  2. Step 2: Convert to fraction form
    70.89/97.80 = 41.79/x
  3. Step 3: Cross multiply
    70.89x = 97.80 × 41.79
  4. Step 4: Simplify right side
    70.89x = 4,087.06
  5. Step 5: Solve for x
    x = 4,087.06/70.89
  6. Step 6: Final answer
    x = 57.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.